Basin



FIG. 1 is a front view of the basin embodying my design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side view thereof, the left side being a mirror image of the right side; and,

FIG. 5 is a perspective view thereof.

The broken line showing is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a basin, as shown and described. 